plusplusjiajia opened a new pull request, #9477:
URL: https://github.com/apache/paimon/pull/9477
### Purpose
Blob and vector columns have no Iceberg type, and variant needs format
version 3, but the mirror only finds out inside IcebergDataField while
converting a schema it has already been told to publish, so the snapshot is
durable by then and every later commit keeps failing the same way; this
validates the same rule where the timestamp and time rules already run, on the
current schema at DDL time and on the whole schema history when the mirror is
enabled on an existing table, so the refusal lands before the commit instead of
after it, and the conversion-layer checks stay as backstops for tables created
before this guard.
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